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Retrieves the allocator interface that this input pin identifies as the interface for the output pin to use.
Syntax
HRESULT GetAllocator( IMemAllocator** ppAllocator ); |
Parameters
- ppAllocator
-
Pointer to an obtained IMemAllocatorobject.
Return Value
Default implementation returns either E_OUTOFMEMORY, if an allocator cannot be created, or NOERROR upon success.
Remarks
This member function implements the IMemInputPin::GetAllocatormethod, which is called by the connected output pin to retrieve an allocator to use for transporting media samples.
By default, this member function creates a CMemAllocatorobject and obtains the IMemAllocatorinterface, to which it adds a reference count for the pin when assigning it to the m_pAllocatordata member, and adds another reference count before passing it back to the output pin.
Override this member function if your filter has another allocator, such as one from a downstream pin, or a specialized allocator to offer the connected output pin.
Requirements
Windows Embedded CE | Windows CE 2.12 and later |
Windows Mobile | Windows Mobile Version 5.0 and later |
Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment,Version 2.12 requires DXPAK 1.0 or later |
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